Corrugated steel web box girder and die-free construction method thereof

Abstract

The invention relates to a corrugated steel web box girder and a die-free construction method thereof, and belongs to the field of building structures. The box girder structure is formed by connecting a top plate, a bottom plate and two corrugated steel webs. A cover plate covers the groove of the corrugated steel web, a stud is arranged at the bottom of the groove, and sandwich concrete is arranged in a space formed by the cover plate and the groove; the opposite faces of the two cover plates are each provided with a transverse connection steel beam. The bolts sequentially penetrate through the two sides of the connecting groove, the cover plate and the transverse connection steel beam. The construction method comprises the steps that S1, the corrugated steel webs and the cover plate are machined and prepared, and the studs are welded in the grooves of the corrugated steel webs; s2, connecting the cover plate and the corrugated steel web to form a structural body, and transporting the structural body to a construction site; s3, the structural body and the bottom plate steel reinforcement framework are hoisted and connected; s4, bottom plate concrete and sandwich concrete between the groove and the cover plate are poured; and S5, a top plate is constructed. While the self weight is reduced, the overall stability is enhanced, the shear bearing capacity of the pier top of the rigid frame bridge and the structure near the supporting point is enhanced, construction is convenient, and the engineering cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of building structures and relates to a corrugated steel web box girder and a formwork-free construction method thereof. Background Art

[0002] The continuous rigid frame bridge with corrugated steel web is a relatively new type of bridge structure. Its main beam uses corrugated steel webs to replace the traditional concrete webs, and the concrete top and bottom plates are connected to the corrugated steel webs through connectors. In terms of structure, the corrugated steel web has a unique corrugated shape, which can significantly improve the shear buckling resistance of the web. In terms of mechanical properties, the corrugated steel web has a light weight, which can greatly reduce the weight of the bridge superstructure, thereby reducing the stress on the lower structure, making it easier for the bridge to achieve a large span. In terms of construction, it can carry out factory prefabrication of corrugated steel webs and on-site installation. Compared with traditional concrete web construction, it can speed up the construction progress, reduce the amount of on-site work and the difficulty of construction. In terms of use, it is often used in the construction of cross-river, cross-river, cross-valley and other transportation routes that require a large span, relatively reasonable requirements for the load-bearing of the lower structure, and certain requirements for bridge landscape.

[0003] Although the corrugated steel web itself has high shear strength, its stability may be insufficient when subjected to complex stress conditions such as lateral force, especially near the pier top and support points of the continuous rigid frame bridge with corrugated steel web, where the structure is subjected to large internal forces such as shear force and bending moment, and is a more critical stress point. Therefore, a section of lining concrete is usually set near the middle support point along the span direction of the bridge to improve the shear bearing capacity and the overall stability of the corrugated steel web.

[0004] At present, the conventional way to arrange lining concrete is to spread a suitable length of lining concrete near the top of the main pier of the bridge. Although this method can help the smooth transmission of shear stress of the beam bridge and increase the anti-buckling capacity of the corrugated steel web, there are still some problems as follows:

[0005] (1) Structural deadweight. Fully lined concrete will significantly increase the overall weight of the bridge superstructure, requiring a higher bearing capacity for the foundation and other lower structures. This runs counter to the original advantage of the corrugated steel web, which can effectively reduce the deadweight of the structure and reduce the load borne by the lower structure.

[0006] (2) Construction difficulty and construction period. If the construction is to be fully lined with concrete, it is necessary to carry out comprehensive concrete pouring construction inside the corrugated steel web, which involves complex formwork, vibration and other processes. Especially when operating in the internal space of the steel web, the construction efficiency is low and the construction is difficult. At the same time, it is also necessary to arrange the steel bars reasonably according to the shear and crack resistance calculation results. This will extend the construction period of the entire bridge and is not conducive to the early commissioning of the project.

[0007] (3) Impact on bridge performance. If the construction quality of the inner lining concrete is poor, it is difficult to ensure that the concrete and the corrugated steel web can work well together at different stress stages. Under some working conditions, due to factors such as the uncoordinated deformation of the two, local stress concentration and other unfavorable conditions may occur, affecting the overall structural performance of the bridge.

[0008] (4) Economic aspect. Fully lining concrete will also increase the amount of concrete materials, the corresponding formwork and construction measures costs, etc., and the overall construction cost will be significantly increased, which is not conducive to project cost control from an economic perspective. Summary of the invention

[0009] In view of this, the object of the present invention is to provide a corrugated steel web box girder and a formwork-free construction method thereof, so as to solve the above-mentioned technical problems and enhance the shear bearing capacity of the pier top and the structure near the support of the continuous rigid frame bridge and the overall stability of the corrugated steel web.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A box girder with corrugated steel webs comprises a top plate and a bottom plate which are arranged in parallel up and down, wherein the top plate and the bottom plate are connected by two corrugated steel webs which are arranged vertically side by side to form a box-type structure with a hollow interior; a cover plate is provided on the groove of the corrugated steel webs, and sandwich concrete is provided in the space between the cover plate and the groove; a cross-linking steel beam is horizontally provided on one side of the cover plate away from the corrugated steel webs.

[0012] Optionally, a bolt is provided at the bottom of the groove.

[0013] Optionally, the cover plate is a split-piece cover plate, each of which covers one of the grooves and is welded to the protrusions on both sides of the groove.

[0014] Optionally, the cover plate is a whole-piece cover plate, which covers a plurality of grooves on the corrugated steel web and is fixed to the corrugated steel web by bolts.

[0015] Optionally, the cross-connected steel beam is a wide flange H-shaped steel with a flange connected to each end of the web, and the bolts sequentially penetrate the raised portions on both sides of the groove, the cover plate, and a flange on one side of the cross-connected steel beam.

[0016] Optionally, the web length b of the transverse steel beam is s ≥40+h0 / 30(mm), where h0 is the height of the web and t is the thickness of the web s ≥ b s / 19(mm).

[0017] Optionally, the top plate and / or bottom plate is a reinforced concrete structural plate.

[0018] Optionally, the transverse steel beam and the cover plate are respectively arranged on opposite surfaces of the two corrugated steel webs.

[0019] A formwork-free construction method for a corrugated steel web box girder comprises the following steps:

[0020] S1, processing and preparing corrugated steel webs and cover plates, each of the cover plates covers at least one groove of the corrugated steel web; and welding studs in the grooves;

[0021] S2, connecting the cover plate to one side of the corrugated steel web in the form of covering the groove, so that a reserved space for pouring sandwich concrete is formed between the groove and the cover plate, and then transporting the connected corrugated steel web-cover plate structure to the construction site;

[0022] S3, hoisting the corrugated steel web-cover plate structure to the prepared bottom plate steel frame, vertically arranging the two corrugated steel web-cover plate structures side by side and connecting them to the upper surface of the bottom plate steel frame, and then horizontally connecting the cross-linking steel beams to the opposite surfaces of the two corrugated steel web-cover plate structures, respectively, and using bolts to penetrate the raised parts on both sides of the groove, the cover plate, and one side flange of the cross-linking steel beam in sequence;

[0023] S4, pouring the bottom plate concrete, the sandwich concrete between the groove and the cover plate in sequence;

[0024] S5. When the core concrete and bottom slab concrete reach the corresponding strength, the top slab construction is carried out.

[0025] Optionally, the cover plate is a piece-type cover plate or a whole-piece cover plate; when it is a piece-type cover plate, each of the cover plates covers one of the grooves, and the cover plates are welded to the protrusions on both sides of the groove; when it is a whole-piece cover plate, each of the cover plates covers several grooves on the corrugated steel web, and is connected to the corrugated steel web together with the cross-linked steel beam by bolts.

[0026] The beneficial effects of the present invention are:

[0027] (1) Formwork-free construction is achieved, simplifying the construction process. The cover plate, corrugated steel web and bottom plate can be used as formwork for pouring concrete, playing the role of positioning and support. No additional formwork is needed, which shortens the construction period and makes the construction faster and more convenient.

[0028] (2) The longitudinal performance of the original corrugated steel web is not changed. Since concrete is only arranged along the height of the beam, when the structure as a whole is subjected to axial force or axial deformation caused by other load effects, the corrugated steel web can easily expand and contract along the corrugation direction like an "accordion".

[0029] (3) Improve the stability of the structure. This structure can effectively connect the sandwich concrete with the cover plate and the corrugated steel web, with good overall performance. When external loads act on it, it can also generate counter pressure to prevent the web from deforming and buckling, thereby enhancing the stability of the structure.

[0030] (4) Reduce the deadweight of the structure. The present invention only fills concrete in the reserved area between the corrugated steel web and the cover plate, which greatly reduces the amount of concrete required for the entire structure, making the structure lighter.

[0031] (5) The sandwich concrete forms a "hoop effect" and does not require reinforcement. Due to the restrictions of the cover plate, corrugated steel web and bottom plate, the concrete filled inside is constrained. When the concrete is subjected to axial pressure and tends to expand laterally, the external constraints will limit the lateral deformation of the concrete, thereby placing the concrete in a three-dimensional compressive state, improving the compressive strength and deformation capacity of the concrete, and eliminating the need to configure steel bars in the concrete.

[0032] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0034] Figure 1 It is a three-dimensional schematic diagram of a corrugated steel web box girder;

[0035] Figure 2 for Figure 1 sectional view of

[0036] Figure 3 It is a schematic diagram of a split-piece cover plate and a whole-piece cover plate;

[0037] Figure 4 Schematic diagram of adding studs to the corrugated steel web;

[0038] Figure 5 for Figure 4 Schematic diagram of adding a cover plate on the basis of;

[0039] Figure 6 for Figure 5 A cross-sectional schematic diagram of adding a split cover plate;

[0040] Figure 7 for Figure 5 Schematic cross-sectional view of adding a one-piece cover plate.

[0041] Reference numerals:

[0042] 1 top plate, 2 bottom plate, 3 corrugated steel web, 31 groove, 32 raised part, 4 cover plate, 5 sandwich concrete, 6 cross-linked steel beam, 61 web, 62 flange, 7 studs, 8 bolts. DETAILED DESCRIPTION

[0043] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0044] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0045] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0046] See also Figure 1 to Figure 7 , is a box girder with corrugated steel webs 3, comprising a top plate 1 and a bottom plate 2 arranged in parallel, the top plate 1 and the bottom plate 2 are connected by two corrugated steel webs 3 arranged vertically side by side to form a box structure with a hollow interior; a cover plate 4 is provided on the groove 31 of the corrugated steel web 3, a bolt 7 is provided at the bottom of the groove 31, and a sandwich concrete 5 is provided in the space between the cover plate 4 and the groove 31; a horizontal steel beam 6 is horizontally provided on the side of the cover plate 4 away from the corrugated steel web 3. The horizontal steel beam 6 and the cover plate 4 are respectively arranged on the opposite surfaces of the two corrugated steel webs 3. The top plate 1 and the bottom plate 2 are both reinforced concrete structural plates.

[0047] The cover plate 4 can be a split cover plate 4 or a whole cover plate 4. When the cover plate 4 is a split cover plate 4, each split cover plate 4 covers a groove 31, and the protrusions 32 on both sides of the groove 31 are welded. When the cover plate 4 is a whole cover plate 4, one whole cover plate 4 covers several grooves 31 on the corrugated steel web 3, and is fixed to the corrugated steel web 3 by bolts 8, and correspondingly, several bolt 8 holes are opened on the whole cover plate 4.

[0048] The cover plate 4 and the corrugated steel web 3 can be connected by welding or by bolts 8. For the split cover plate 4, the cover plate 4 can be fixed to the corrugated steel web 3 by welding or bolts 8; when a whole cover plate 4 is used, in order to establish good contact with the corrugated steel web 3, it is preferably connected by bolts 8 so that the two can establish a good connection, which is conducive to the subsequent pouring of concrete. In the present invention, when welding or bolts 8 are used for connection, the design size and specific form of the related structure can be appropriately adjusted according to the actual engineering situation while maintaining reliable connectivity, but it is necessary to meet the requirements of relevant design specifications.

[0049] The whole cover plate 4 can be used as a formwork and a reinforcing member in the corrugated steel web box girder constructed without formwork. It is connected to the corrugated steel web 3 and encloses an internal space area with the corrugated steel web 3 and the beam bottom plate 2 for filling the sandwich concrete 5. The setting of the whole cover plate 4 eliminates the need to set up additional formwork when pouring concrete, simplifies the construction process and improves the construction efficiency; the whole cover plate 4 is connected to the corrugated steel web 3 by bolts or welding, so that the sandwich concrete 5, the cover plate 4 and the corrugated steel web 3 can be effectively connected together to form a structure with good overall performance; it also enhances the stability of the bridge structure, especially in the large shear force area, and can effectively resist the deformation and buckling caused by external loads; compared with the segmented cover plate 4, the whole cover plate 4 is simpler and faster in the installation and connection process, reducing the construction difficulty and construction period.

[0050] The layout length of the cover plate 4 can be adjusted according to the length of the less stable beam section. For a continuous rigid frame bridge with a corrugated steel web 3, the layout length on one side of the main pier should not be less than the beam height at the bridge support.

[0051] For a continuous rigid frame bridge with corrugated steel web 3, when the beam height is generally high, the cross-connected steel beam 6 may not be arranged; when the beam height is too high and only sandwich concrete 5 cannot meet the required stability requirements, such as the section within the main pier of the bridge and its vicinity, it is necessary to arrange cross-connected steel beams 6 at the center of the beam height along both sides of the beam length direction. The cross-connected steel beams 6 can be made of steel or other forms of steel beams, such as H-shaped steel. The wing plates of the cross-connected steel beams 6 are simultaneously connected to the cover plate 4 and the corrugated steel web 3, and the connection method can be welding or high-strength bolts 8 to enhance the stability of the section.

[0052] The cross-linked steel beam 6 is a wide flange 62 H-shaped steel (HW) with a flange 62 connected to each end of the web 61. The bolts 8 penetrate the protrusions 32 on both sides of the connecting groove 31, the cover plate 4, and the flange 62 of one side of the cross-linked steel beam 6 in sequence. The selection of the cross-linked steel beam 6 refers to the relevant requirements on the size of the transverse stiffener in Article 6.3.6 of the "Steel Structure Design Standard" (GB50017-2017). The length b of the web 61 of the cross-linked steel beam 6 is s ≥40+h0 / 30 (mm), where h0 is the height of the web 61 and the thickness of the web 61 is t s ≥ b s / 19(mm). After determining the dimensions of the first two, the thickness of the flange of the cross-linked steel beam 6 can be determined according to the existing steel section dimensions. At the same time, the cross-linked steel beam 6 can also be customized according to actual engineering requirements, which is more flexible.

[0053] The cross-joint steel beam 6 plays a key reinforcing role in the corrugated steel web box beam constructed without formwork. Especially for the box beam located in the main pier of the bridge and its vicinity, when the beam height is too high, the cross-joint steel beam 6 forms a stable supporting structure by connecting the cover plate 4 and the corrugated steel web 3, which can effectively resist the deformation and buckling caused by external loads, enhance the structural stability of the area, and make the structure more stable when subjected to large shear force, bending moment and other internal forces, thereby improving the bearing capacity of the overall structure.

[0054] A formwork-free construction method for a corrugated steel web three-box girder comprises the following steps:

[0055] S1, processing and preparing corrugated steel webs 3 and cover plates 4, each cover plate 4 covers at least one groove 31 of the corrugated steel web 3; and welding studs 7 in the grooves 31;

[0056] The steel processing plant processes and prepares the corrugated steel web 3, presses and forms the corrugated steel web 3 of the required type according to the relevant design of the bridge structure, welds the shear studs 7 on the inside, and processes the required cover plate 4.

[0057] S2, connect the cover plate 4 to one side of the corrugated steel web 3 in the form of covering the groove 31, so that a reserved space for pouring the sandwich concrete 5 is formed between the groove 31 and the cover plate 4, and then transport the connected corrugated steel web 3-cover plate 4 structure to the construction site;

[0058] At the corresponding web 61 segment, the cover plate 4 is connected to the corrugated steel web 3, leaving a space area required for pouring the sandwich concrete 5 between the two, and then the connected structure is transported to the construction site.

[0059] S3, hoist the corrugated steel web 3-cover plate 4 structure to the prepared bottom plate 2 steel frame, vertically arrange the two corrugated steel web 3-cover plate 4 structures side by side and connect them to the upper surface of the bottom plate 2 steel frame, and then horizontally connect the cross-linking steel beam 6 to the opposite surfaces of the two corrugated steel web 3-cover plate 4 structures, and use bolts 8 to penetrate the raised parts 32 on both sides of the groove 31, the cover plate 4, and the flange 62 of one side of the cross-linking steel beam 6 in sequence;

[0060] S4, pouring concrete of the bottom plate 2, the sandwich concrete 5 between the groove 31 and the cover plate 4 in sequence;

[0061] S5, when the sandwich concrete 5 and the bottom plate 2 concrete reach the corresponding strength, the top plate 1 is constructed, and the pouring and connection work of the top plate 1 is completed, and the construction of the overall structure can be completed.

[0062] The cover plate 4 is a piece-type cover plate 4 or a whole-piece cover plate 4; when it is a piece-type cover plate 4, each cover plate 4 covers a groove 31, and the cover plate 4 is welded to the protrusions 32 on both sides of the groove 31; when it is a whole-piece cover plate 4, each cover plate 4 covers several grooves 31 on the corrugated steel web 3, and is connected to the corrugated steel web 3 together with the cross-linking steel beam 6 by bolts 8.

[0063] The biggest feature of the present invention is the construction and pouring of concrete without formwork. During construction, the cover plate 4 and the corrugated steel web 3 can be connected to the skeleton of the beam bottom plate 2 to form a whole, and the bottom plate 2 is poured first. After the bottom plate 2 is poured, the cover plate 4, the beam bottom plate 2 and the corrugated steel web 3 together enclose an internal space area, which acts as a formwork. When pouring concrete in the internal area, there is no need to set up a formwork, and only concrete needs to be poured from the top, achieving the effect of formwork-free construction. This structure can reduce the process and complexity in bridge construction and realize assembly to a certain extent.

[0064] The present invention is applicable to but not limited to a continuous rigid frame bridge with corrugated steel webs 3. It does not require a formwork, reduces the dead weight of the structure, saves construction costs, and speeds up construction. It realizes the assembly of bridge construction to a certain extent, and is worthy of praise and practical application.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A corrugated steel web box girder, characterized in that: The invention comprises a top plate (1) and a bottom plate (2) which are arranged in parallel up and down, wherein the top plate (1) and the bottom plate (2) are connected to each other via two corrugated steel webs (3) which are arranged vertically side by side to form a box-shaped structure with a hollow interior; a cover plate (4) is provided on the groove (31) of the corrugated steel web (3), and a sandwich concrete (5) is provided in the space between the cover plate (4) and the groove (31); and a cross-linking steel beam (6) is horizontally provided on the side of the cover plate (4) away from the corrugated steel web (3).

2. The corrugated steel web box girder according to claim 1, characterized in that: A bolt (7) is provided at the bottom of the groove (31).

3. The corrugated steel web box girder according to claim 1, characterized in that: The cover plate (4) is a split-piece cover plate (4), each of the split-piece cover plates (4) covers one of the grooves (31) and is welded to the raised portions (32) on both sides of the groove (31).

4. The corrugated steel web box girder according to claim 1, characterized in that: The cover plate (4) is a whole-piece cover plate (4), and one whole-piece cover plate (4) covers a plurality of grooves (31) on the corrugated steel web (3), and is fixed to the corrugated steel web (3) by bolts (8).

5. The corrugated steel web box girder according to claim 4, characterized in that: The cross-connected steel beam (6) is a wide flange (62) H-shaped steel with a flange (62) connected to each end of the web (61), and the bolts (8) are sequentially passed through the raised portions (32) on both sides of the groove (31), the cover plate (4), and a flange (62) on one side of the cross-connected steel beam (6).

6. The corrugated steel web box girder according to claim 5, characterized in that: The web (61) length b of the transverse steel beam (6) s ≥40+h0 / 30 (mm), where h0 is the height of the web (61), and the thickness of the web (61) is t s ≥ b s / 19(mm).

7. The corrugated steel web box girder according to claim 1, characterized in that: The top plate (1) and / or the bottom plate (2) are reinforced concrete structural plates.

8. The corrugated steel web box girder according to claim 1, characterized in that: The transverse steel beam (6) and the cover plate (4) are respectively arranged on opposite surfaces of the two corrugated steel webs (3).

9. A formwork-free construction method for a corrugated steel web box girder, characterized in that: The following steps are involved: S1, processing and preparing a corrugated steel web (3) and a cover plate (4), wherein each cover plate (4) covers at least one groove (31) of the corrugated steel web (3); and welding a stud (7) in the groove (31); S2, connecting the cover plate (4) to one side of the corrugated steel web (3) in a form of covering the groove (31), so that a reserved space for pouring sandwich concrete (5) is formed between the groove (31) and the cover plate (4), and then transporting the connected corrugated steel web (3)-cover plate (4) structure to the construction site; S3, hoisting the corrugated steel web (3)-cover plate (4) structure to the prepared bottom plate (2) steel frame, vertically arranging the two corrugated steel web (3)-cover plate (4) structures side by side and connecting them to the upper surface of the bottom plate (2) steel frame, and then horizontally connecting the cross-linking steel beam (6) on the opposite surfaces of the two corrugated steel web (3)-cover plate (4) structures, respectively, and using bolts (8) to sequentially penetrate the raised portions (32) on both sides of the groove (31), the cover plate (4), and a side flange (62) of the cross-linking steel beam (6); S4, pouring concrete of the bottom plate (2), the sandwich concrete (5) between the groove (31) and the cover plate (4) in sequence; S5, when the core concrete (5) and the bottom plate (2) concrete reach corresponding strengths, the top plate (1) is constructed.

10. The formwork-free construction method of the corrugated steel web box girder according to claim 9, characterized in that: The cover plate (4) is a split-piece cover plate (4) or a whole-piece cover plate (4); when it is a split-piece cover plate (4), each of the cover plates (4) covers one of the grooves (31), and the cover plate (4) is welded to the protrusions (32) on both sides of the groove (31); when it is a whole-piece cover plate (4), each of the cover plates (4) covers a plurality of grooves (31) on the corrugated steel web (3), and is connected to the corrugated steel web (3) together with the cross-connecting steel beam (6) by bolts (8).

Images